[PATCH] libata: minor patch before moving err_mask

- add qc to ata_pio_poll()
  - reorder the initialization of qc in ata_pio_complete()

Signed-off-by: Albert Lee <albertcc@tw.ibm.com>

===================
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

drivers/scsi/libata-core.c

@@ -2802,10 +2802,14 @@ void ata_poll_qc_complete(struct ata_queued_cmd *qc, unsigned int err_mask)
 
 static unsigned long ata_pio_poll(struct ata_port *ap)
 {
+	struct ata_queued_cmd *qc;
 	u8 status;
 	unsigned int poll_state = HSM_ST_UNKNOWN;
 	unsigned int reg_state = HSM_ST_UNKNOWN;
 
+	qc = ata_qc_from_tag(ap, ap->active_tag);
+	assert(qc != NULL);
+
 	switch (ap->hsm_task_state) {
 	case HSM_ST:
 	case HSM_ST_POLL:
@@ -2870,15 +2874,15 @@ static int ata_pio_complete (struct ata_port *ap)
 		}
 	}
 
+	qc = ata_qc_from_tag(ap, ap->active_tag);
+	assert(qc != NULL);
+
 	drv_stat = ata_wait_idle(ap);
 	if (!ata_ok(drv_stat)) {
 		ap->hsm_task_state = HSM_ST_ERR;
 		return 0;
 	}
 
-	qc = ata_qc_from_tag(ap, ap->active_tag);
-	assert(qc != NULL);
-
 	ap->hsm_task_state = HSM_ST_IDLE;
 
 	ata_poll_qc_complete(qc, 0);